06 wr stock pilot jet size and jetting question?

[rtdk]

i just installed the Zip ty fuel mixture screw and according to the instructions "if your settings average near seated then a smaller pilot jet may be advised". i have the ZipTy screw at 1.25 turns out and it is were the bike seems to run better.

i installed the GYTR AIS removal kit and the PMB baffle, along with the gray wire and open air box. The GYTR kit gives you a different bleed screw and needle which i replaced.

Before i did all this the bike was running very lean and it turned my pipe blue.

Any advise as far as what pilot jet to use?

should i replace the main as well?

i mostly ride the desert, but do some mountain rides also. ?

[bwenz]

I also have an 06 wr250f and ride in Ca, I can tell you what I run works pretty well for down here. I replaced the main and the pilot, as well as the leak jet (bleed screw). I went form the stock main ( which is I think a 168) to a 178, and from a 42 pilot to a 45, and the leak jet that comes with the GYT-R kit is a 90, stock is 80, and everyone around here will recomend a 40, which is also what I use now. The set up is great. Maybe someone else can better explain why not to use the 90 leak jet, but it will help out the zero to 1/4 throttle to run a 40 leak jet.

The only other difference between our bikes is that I run the GYT-R exhaust, but all the other mods are the same.

You can also check the jetting database to see what different people are doing.

[skinhead]

Best suggestion would be to purchase a JD jetting kit and install it according to the instructions. This will help out your performance greatly. ?

If your fuel screw is less than 3/4 to 1/2 turn out or less you need a smaller jet, if you are at 2 1/2 or more out you will need a bigger pilot jet. At 1 1/4 your pilot should be fine. ?

The #40 pilot jet allows more fuel into the system when you crack open the throttle.

Jeff

[rtdk]

Thanks for the input. ?

I think that i'll leave it for now and go for a ride see how it works but I might go for the 40 jet...

Would all of this mods keep the bike from running lean(turning pipe blue).

Or should i still try to get the dean kit?

[skinhead]

The JD kit was the single best improvement in performance and well worth the price (from the TT store), ? and in conjunction with the trottle stop, grey wire, and 40 leak jet the bike is real awesome. Of course it only gets better when you put a White Brothers carbon/titanium YZF exhaust system.

The pipe will generally turn blue anyway. The best way to tell if you are lean is the spark plug test (lighter is leaner) and/or backfiring in decleration. There is also some great info at www.thumperfaq.com and in the jetting database in the sticky at the top of the forum.

Cheers

Jeff

[rtdk]

thanks again ?

[jsalpine]

Has anyone tried changing the #70 Pilot Air Jet (5TA-14943-15-00) that is stock on the "06 WR to a #100 or #105 (5TA-14943-28-00) that is stock on the '06 YZ? That was one of the first things that I did on my '02 WR. What is this #115 jet (5UM-1494F-30-00), is that the Main Air Jet? This jet is only found on the '06 WR, my '02 WR had a #200 Main Air Jet.